Also, I would think that any kind of ball joint would work on the shaft at the steering end. I imagine a steering joint from a riding lawn mower would fit in that spot, but you may be able to find something on McMaster Carr like the "Ball Joint Linkages" in the link below.
McMaster-Carr
Borrowing tools is for the weak.
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2000 Max IV, 25hp Kohler Command, 26" Titan Tru Power AT's
1996 Max IV, 18hp Briggs, 24" Serwas
1998 Max IV (project in waiting)
1995/1999 Max II, 16hp Briggs, 21" Rawhides
Hustler 950 (Project in waiting)